Update automate-the-org's Add Update Label Weekly action to the Node 24 runtime

### Overview

We need `hackforla/automate-the-org`'s Add Update Label Weekly action to declare the `node24` runtime instead of `node20`, because GitHub has deprecated Node 20 and is already force-running the action on Node 24. Every weekly run in `devops`, `devops-security` and `incubator` carries the deprecation annotation, and the forcing is transitional behaviour rather than a fix.

### Action Items

- [ ] **Note the change lands in a different repository.** The fix is in `hackforla/automate-the-org`, which is not on this board and carries none of our label axes, so this issue tracks the work and the PR goes there. Nothing in `hackforla/devops` is edited by this issue.
- [ ] In `gha-add-update-label-weekly/action.yml`, change `runs: using: 'node20'` to `using: 'node24'`. Line 19 as of 2026-09-12; find it by `using:` if it has drifted.
- [ ] Confirm this is still the only `action.yml` in that repository before assuming the change is complete — it was on both 2026-09-10 and 2026-09-12, so there is no second action to sweep, but a new one would need the same treatment.
- [ ] Check whether `dist/index.js` needs rebuilding against Node 24, or whether the declaration change alone is sufficient. It is a bundled JS action, so the runtime declaration and the bundle are separate concerns; if the build pipeline pins a Node version, bump it in the same pass.
- [ ] Cut a new `v1.x` release and move the floating `v1` tag onto it.
- [ ] **Do not open PRs on the three consumer repos.** `devops`, `devops-security` and `incubator` each call `hackforla/automate-the-org/gha-add-update-label-weekly@v1` from their own `.github/workflows/add-update-label-weekly.yml`. All three float on `@v1`, so moving that tag propagates the fix to all three at once. Three consumer PRs would be redundant and would not make the fix land any sooner.
- [ ] After the release, run one consumer's workflow by hand — `gh workflow run add-update-label-weekly.yml -R hackforla/devops` — and confirm the run's annotations no longer include *"Node.js 20 is deprecated"*. The ATO workflow has `workflow_dispatch`, so this does not have to wait for the weekly schedule.
- [ ] Confirm the same on a second consumer. That checks the floating tag actually resolving for every caller rather than one repo's result.

### Resources/Instructions

- The annotation, seen on real runs: *"Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: hackforla/automate-the-org/gha-add-update-label-weekly@v1"*. Found 2026-09-10 while running the post-merge regression check for https://github.com/hackforla/devops/issues/220.
- **A green run history is not evidence against this.** The forced upgrade is GitHub's transition behaviour, so runs succeed today and will keep succeeding until the forcing stops. This is a countdown, not a breakage — check GitHub's current deprecation timeline when sizing the urgency.
- **Deliberately out of scope: the `actions/create-github-app-token@v3` `app-id` deprecation.** The same runs carry a second annotation saying `app-id` is deprecated in favour of `client-id`. That line sits in each of the three consumer repos' own workflow files rather than in the action — but those files appear to have been vendored from automate-the-org in the first place, so whether a local fix would survive the next rollout is unconfirmed. Settle that before editing any of the three; this change does not fix it.
- `main` and the `v1` tag were the same commit as of 2026-09-10, and `v1` resolved to `v1.3.0`, so what the three repos run today is what is on that repo's `main`.
- Precedent for filing here rather than there: https://github.com/hackforla/devops/issues/182, a deprecation bump whose code lives in the @danielridgebot repo, and https://github.com/hackforla/devops/issues/223, which tracks bot-repo work on this board for the same reason.

Start in hackforla/automate-the-org's gha-add-update-label-weekly/action.yml and inspect its using declaration, then check dist/index.js and the repository's build configuration for any Node-version dependency. Verify there is only one action.yml, move the v1 tag after a new v1.x release, and manually run add-update-label-weekly.yml in hackforla/devops plus one other consumer to confirm the Node.js 20 deprecation annotation is gone.

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